linting error for raw string macro

[rapus95]

as you can see it suddenly stops recognizing using statements

[greimel]

It seems that Pluto doesn't realize that "\\" is an escaped backslash, but thinks that the second " is escaped. See the reduced example

begin
	"\\"
	x = 5
end

[fonsp]

Thanks! Moved to https://github.com/lezer-parser/julia/issues/11